EP1296055A2 - Injecteur de carburant avec plaque à orifices d'étranglement - Google Patents

Injecteur de carburant avec plaque à orifices d'étranglement Download PDF

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Publication number
EP1296055A2
EP1296055A2 EP02020960A EP02020960A EP1296055A2 EP 1296055 A2 EP1296055 A2 EP 1296055A2 EP 02020960 A EP02020960 A EP 02020960A EP 02020960 A EP02020960 A EP 02020960A EP 1296055 A2 EP1296055 A2 EP 1296055A2
Authority
EP
European Patent Office
Prior art keywords
passage
fuel
control chamber
plate
pressure control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02020960A
Other languages
German (de)
English (en)
Other versions
EP1296055A3 (fr
EP1296055B1 (fr
Inventor
Koichi Ohata
Nobuhisa Kakehashi
Toshiyuki Yoda
Eiji Itou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2001286934A external-priority patent/JP3882555B2/ja
Priority claimed from JP2001367031A external-priority patent/JP3882597B2/ja
Application filed by Denso Corp filed Critical Denso Corp
Publication of EP1296055A2 publication Critical patent/EP1296055A2/fr
Publication of EP1296055A3 publication Critical patent/EP1296055A3/fr
Application granted granted Critical
Publication of EP1296055B1 publication Critical patent/EP1296055B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus

Definitions

  • the present invention relates to a fuel injection valve, in which injection amount and injection timing are controlled by changing fuel pressure of a pressure control chamber.
  • a common rail fuel injection system in which high pressure fuel accumulated in a common rail is injected into a combustion chamber, is well known.
  • Afuel injection valve which is applicable to the common rail fuel injection system, has a pressure control chamber, whose pressure is controlled by fuel supplied thereto through an entrance orifice provided in a fuel flow-in passage and ejected therefrom through an exit orifice provided in a fuel flow-out passage for giving backpressure to a control piston movable together with a needle.
  • the injection amount and injection timing are variable based on a change of the fuel pressure of the pressure control chamber (backpressure to the control piston).
  • the fuel pressure of the pressure control chamber is changed by an electromagnetic valve that is operative to open and close the fuel flow-out passage including the exit orifice through which the pressure control chamber communicates with a low pressure source.
  • a first plate in which the entrance orifice is formed and a second plate in which the exit orifice is formed are different members.
  • This causes an inconvenience, on adjusting length of the entrance orifice for securing a target flow amount of fuel, that a change of enlarging the length of the entrance orifice is not sufficiently free, since the entrance orifice is limited to be positioned within the first plate whose thickness is relatively thin. Therefore, in this case, instead of enlarging the length of the entrance orifice, the diameter of the entrance orifice is obliged to be reduced for the adjustment of fuel flow.
  • An object of the present invention is to provide a fuel injection valve having a piece of plate in which both of an entrance orifice and an exit orifice are formed so that length of the entrance orifice is easily changed for adjusting a flow amount of fuel passing therethrough to a target value.
  • the fuel injection valve having a pressure control chamber to which fuel is supplied from high pressure source via a fuel flow-in passage including an entrance orifice and from which the fuel is ejected to a low pressure source via a fuel flow-out passage including an exit orifice, a nozzle provided with a needle making an axial and reciprocal movement in response to fuel pressure in the pressure control chamber and with an injection hole to be opened and closed by the movement of the needle, and an electromagnetic valve operative to allow and interrupt a fuel communication between the fuel flow-out passage and the low pressure source for controlling the fuel pressure in the pressure control chamber, the fuel flow-in passage, the fuel flow-out passage and at least a part of the pressure control chamber are formed in a single piece of a plate.
  • the part of the pressure control chamber is opened to an axial end surface of the plate and the fuel flow-out passage extends so as to penetrate the plate axially from an inner wall of the part of the pressure control chamber to another axial end surface of the plate.
  • the fuel flow-in passage comprises a first passage extending from the axial end surface of the plate and a second passage extending from the inner wall of the part of the pressure control chamber, which intersect with each other within the plate.
  • the entrance orifice is formed in one of the first and second passages.
  • one of the first and second passages is a blind passage and at least a part of the other of the first and second passages is the entrance orifice running into the blind passage.
  • the first passage is the blind passage
  • an end of the entrance orifice of the second passage is opened to the inner wall of the part of the pressure control chamber and another end thereof is opened to a vicinity of a dead end of the blind passage.
  • the second passage is the blind passage whose inner diameter is axially substantially uniform
  • the first passage is provided at an end thereof on a side of the second passage with the entrance orifice opened to the blind passage at a position away by more than 0.2 mm from a dead end thereof.
  • the entrance orifice of the first passage is connected substantially perpendicularly to the second passage.
  • an angle of the first passage to the axial end surface of the plate which is an angle opposed to the second passage, falls within a range from 25° to 90° and an angle of the second passage to the axial end surface of the plate, which is an angle opposed to the first passage, falls within a range from 15° to 55°.
  • the inner wall of the part of the pressure control chamber is at least partly a conical shape inner wall whose diameter is larger toward the axial end surface of the plate and to which the second passage is opened.
  • an extended axial line of the second passage passes through inside of the part of the pressure control chamber without running against the inner wall thereof.
  • An injector 1 according to a first embodiment is described with reference to Figs. 1,2A and 2B.
  • the injector 1 is inserted to and mounted on an engine head of an engine (not shown) and injects high pressure fuel supplied from a common rail (not shown) directly to each inside of cylinders of the engine.
  • the injector 1 is composed mainly of a nozzle 50, a nozzle holder 2, a control piston 3, an orifice plate 4 and an electromagnetic valve 5.
  • the nozzle 50 is composed of a nozzle body 6 provided at a leading end thereof with an injection hole 6a, a needle 7 disposed slidably and reciprocatingly in the nozzle body 6 and a retaining nut 8 with which the nozzle body is connected to a lower part of the nozzle holder 2.
  • the nozzle holder 2 is provided with a fuel introduction passage 10 through which high pressure fuel supplied from the common rail (high pressure source) is introduced to a fuel passage 9 formed inside the nozzle body 6, a fuel supply passage 11 through which the high pressure fuel from the common rail is supplied to a pressure control chamber 11 (also refer to Fig. 2A) and a fuel ejecting passage 13 through which the fuel from the control pressure chamber 11 is ejected to a low pressure source.
  • a fuel introduction passage 10 through which high pressure fuel supplied from the common rail (high pressure source) is introduced to a fuel passage 9 formed inside the nozzle body 6, a fuel supply passage 11 through which the high pressure fuel from the common rail is supplied to a pressure control chamber 11 (also refer to Fig. 2A) and a fuel ejecting passage 13 through which the fuel from the control pressure chamber 11 is ejected to a low pressure source.
  • the control piston 3 is slidably housed in a cylinder 14 formed inside the nozzle holder 2.
  • the control piston 3 is connected to the needle 7 via a pressure pin 15 slidably accommodated in a cylinder 14 formed inside the nozzle holder 2.
  • the orifice plate 4 is arranged at an axial end of the nozzle holder 2 to which an upper end of the cylinder 14, which constitutes the pressure control chamber 11, is opened.
  • the orifice plate 4 is provided at an axial end with a part of the pressure control chamber 11 being opened to and communicating with the cylinder 14, a fuel flow-in passage 60 communicating with the fuel supply passage 12 of the nozzle holder 2, and a fuel flow-out passage 70 capable to communicate via the electromagnetic valve 5 with the fuel ejecting passage 13.
  • An inner wall of the part of the pressure control chamber 11 is at least partly a conical shape inner wall whose diameter is larger toward the axial end surface of the orifice plate 4.
  • the fuel flow-out passage 70 extends so as to penetrate the orifice plate 4 axially from the inner wall of the part of the pressure control chamber 11 to another axial end surface of the orifice plate 11.
  • the fuel flow-out passage 70 is provided at an upper part thereof with an exit orifice 20.
  • the fuel flow-in passage 60 is composed of a first passage 19 extending from the axial end surface of the orifice plate 4 and a second passage 17 extending from the inner wall of the part of the pressure control chamber 11, which intersect with each other within the orifice plate 4.
  • the second passage 17 is a blind passage and an entrance orifice 18 formed partly in the first passage 19 runs into the second passage 17 (blind passage).
  • the entrance orifice 18 is formed by drilling from an axial end surface of the orifice plate 4.
  • the second passage 17, whose diameter is axially substantially uniform, is formed as the blind passage by drilling from the inner wall of the part of the pressure control chamber 11 so that an extended axial line of the second passage 17 passes through inside of the part of the pressure control chamber 11 without running against the inner wall thereof.
  • the entrance orifice 18 is connected substantially perpendicularly to the first passage 17 at a position away by more than 0.2 mm from a dead end of the first passage.
  • Inner diameter (flow path diameter) of the exit orifice 20 is larger than that of the entrance orifice 18.
  • the electromagnetic valve 5 is composed of an armature 21 operative to allow and interrupt a flow communication between the fuel flow-out passage 70 and the fuel ejecting passage 13 by opening and closing the exit orifice 20, a spring 21 urging the armature 21 in a valve closing direction (downward in Fig. 1), a solenoid 23 driving the armature 21 in a valve opening direction.
  • the electromagnetic valve 5 is mounted via the orifice plate 4 on the axial end of the nozzle holder 2 and connected to the nozzle holder 2 by a retaining nut 24.
  • Fuel is discharged from a fuel injection pump (not shown) and delivered to the common rail.
  • High pressure fuel which is accumulated to given pressure in the accumulated pressure chamber of the common rail, is introduced to the fuel passage 9 of the nozzle body 6 and to the pressure control chamber 11.
  • the electromagnetic valve 5 When the electromagnetic valve 5 is in a valve closing state (in a state that the armature 21 closes the exit orifice 20), high pressure of fuel introduced to the pressure control chamber acts on the needle 7 via the control piston 3 and the pressure pin 15 and, in corporation with a biasing force of the spring 16, urges the needle 7 in a valve closing direction.
  • High pressure of fuel introduced in the fuel passage 9 acts on a pressure receiving surface of the needle 7 and urges the needle 7 in a valve opening direction.
  • a force of urging the needle 7 in a valve closing direction is greater than that in a valve opening direction so that the needle 7 does not lift, thereby the injection hole 6a being closed not to inject fuel.
  • the solenoid 23 When the solenoid 23 is energized and the electromagnetic valve is in a valve opening state (in a state that the armature 21 opens the exit orifice 20), the fuel communication between the fuel flow-out passage 70 and the fuel ejecting passage 13 is allowed so that the fuel in the pressure control chamber 11 is ejected via the fuel ejecting passage 13 to the low pressure source. Even if the electromagnetic valve 5 is in a valve opening state, high pressure fuel continues to be supplied to the pressure control chamber 11. However, the fuel pressure of the pressure control chamber 11 acting on the control piston 3 is reduced.
  • the force of urging the needle 7 in a valve closing direction based on a sum of the fuel pressure of the pressure control chamber 11 and the biasing force of the spring 16 is reduced and, when the force of urging the needle 7 in a valve opening direction exceeds that in a valve closing direction, the needle 7 starts lifting so that the injection hole 6a is opened to inject fuel.
  • injection behaviors such as injection amount and injection timing are controlled by changing the fuel pressure of the pressure control chamber 11. Therefore, it is required to accurately control so as to stabilize the fuel pressure of the pressure control chamber 11 for securing stable fuel injection. It is inevitable for this purpose to stabilize a flow of fuel in the second passage 17 after the fuel passes through the fuel flow-in passage 60, in particular, in case that the entrance orifice 18 runs into the second passage 17.
  • Fig. 4 shows a test result showing every injection cycle variation 2 ⁇ of injection amount, when the distance L is changed under conditions that fuel pressure is 160 MPa and width of drive pulse is 1.01 ms. According to this test result, it is proved that stabilization of every fuel injection largely depends on the distance L and, at the distance L ⁇ 0.2 mm, every injection amount variation is relatively small. It can be concluded that, when the entrance orifice 18 is connected perpendicularly to the blind passage 17 whose inner diameter is axially uniform, the distance L ⁇ 0.2 mm serves to reduce the every injection amount variation of the fuel injection valve 1.
  • the entrance orifice 18 and the exit orifice 20 are formed in a single piece of the orifice plate 4, an axial length of the orifice plate 4 is longer, compared with the conventional orifice plate made of two pieces, so that the orifice plate 4 has a sufficient space for securing an adequate length of the entrance orifice 18, whereby enhancing freedom on designing the entrance orifice 18 in such a manner that an angle of the first passage 19 to the axial end surface of the orifice plate 4 and an angle of the second passage 17 to the axial end surface of the orifice plate 4 are adequately adjusted.
  • the orifice plate 4 according to the first embodiment may be modified to an orifice plate 4 according to a second embodiment, as shown in Fig. 5.
  • the orifice plate 4 according to the second embodiment is different from the orifice plate 4 according to the first embodiment in a point that the fuel flow-in passage 60 is composed of a first passage 38, which is a blind passage 38, extending from the axial end surface of the orifice plate 4 and a second passage 37, which is an entrance orifice 37, extending from the inner wall of the part of the pressure control chamber 11, which intersect with each other within the orifice plate 4.
  • the first passage 38 is formed by drilling from an axial end surface of the orifice plate 4.
  • the entrance orifice 37 is formed by drilling from the inner wall of the part of the pressure control chamber 11 so that an extended axial line of the second passage 17 passes through inside of the part of the pressure control chamber 11 without running against the inner wall thereof .
  • an axial length of the orifice plate 4 is longer, compared with the conventional orifice plate made of two pieces, so that the orifice plate 4 has a sufficient space for securing an adequate length of the entrance orifice 37, whereby enhancing freedom on designing the entrance orifice 37 in such a manner that an angle ⁇ 1 of the first passage (blind passage) 38 to the axial end surface of the orifice plate 4, as shown in Figs. 6A and 6B, and an angle of the second passage (entrance orifice) 37 to the axial end surface of the orifice plate 4, as shown in Figs. 7A and 7B, are adequately adjusted.
  • the angle ⁇ 1 of the first passage (blind passage) 38 to the axial end surface of the orifice plate 4 falls within a range from 25° to 90° and the angle ⁇ 2 of the second passage (entrance orifice) 37 to the axial end surface of the orifice plate 4 falls within a range from 15° to 55°.
  • an amount of fuel passing through the entrance orifice 37 is variable according to a variation of a length of the entrance orifice 37 and the length of the entrance orifice 37 can be enlarged by changing the angle ⁇ 1 or ⁇ 2 of the first or second passages 38 or 37 from a state shown in Fig. 6A or 7B to that shown in Fig. 6B or 7A. Accordingly, it is very easy to slightly change the flow amount of fuel passing through the entrance orifice 37 in order to secure accurate and stable fuel injection.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP02020960A 2001-09-20 2002-09-19 Injecteur de carburant avec plaque à orifices d'étranglement Expired - Lifetime EP1296055B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2001286934A JP3882555B2 (ja) 2001-09-20 2001-09-20 燃料噴射弁
JP2001286934 2001-09-20
JP2001367031A JP3882597B2 (ja) 2001-11-30 2001-11-30 燃料噴射弁
JP2001367031 2001-11-30

Publications (3)

Publication Number Publication Date
EP1296055A2 true EP1296055A2 (fr) 2003-03-26
EP1296055A3 EP1296055A3 (fr) 2004-12-01
EP1296055B1 EP1296055B1 (fr) 2006-01-11

Family

ID=26622591

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02020960A Expired - Lifetime EP1296055B1 (fr) 2001-09-20 2002-09-19 Injecteur de carburant avec plaque à orifices d'étranglement

Country Status (4)

Country Link
US (1) US6698666B2 (fr)
EP (1) EP1296055B1 (fr)
CN (1) CN1208548C (fr)
DE (1) DE60208615T2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102400823A (zh) * 2011-11-09 2012-04-04 王晓燕 一种电控柴油机喷油器
WO2015078629A1 (fr) * 2013-11-28 2015-06-04 Robert Bosch Gmbh Injecteur de carburant
WO2016005180A1 (fr) * 2014-07-08 2016-01-14 Delphi International Operations Luxembourg S.À R.L. Injecteur de carburant pour moteur à combustion interne
WO2016020469A1 (fr) * 2014-08-08 2016-02-11 Continental Automotive Gmbh Dispositif d'étranglement pour commander une quantité de carburant à alimenter par un injecteur de carburant et système d'injection

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4062221B2 (ja) * 2003-09-17 2008-03-19 株式会社デンソー 電磁アクチュエータ、電磁アクチュエータの製造方法、および燃料噴射弁
JP4066959B2 (ja) * 2004-01-27 2008-03-26 株式会社デンソー 燃料噴射装置
JP2005226580A (ja) * 2004-02-13 2005-08-25 Denso Corp 燃料噴射装置
JP4301047B2 (ja) * 2004-03-18 2009-07-22 株式会社デンソー コイル装置、コイル装置の製造方法、および燃料噴射弁
JP2006090176A (ja) * 2004-09-22 2006-04-06 Denso Corp インジェクタ
DE102007038139A1 (de) * 2007-08-13 2009-02-19 Robert Bosch Gmbh Elektrischer Stecker mit Kraftstoffrücklauf
JP5169669B2 (ja) * 2007-11-02 2013-03-27 株式会社デンソー 燃圧検出装置、及び燃圧検出システム
JP5262933B2 (ja) * 2009-04-03 2013-08-14 株式会社デンソー 燃料噴射装置
EP2570650B1 (fr) * 2010-05-12 2015-06-24 Toyota Jidosha Kabushiki Kaisha Clapet d'injection de combustible
JP5195890B2 (ja) * 2010-12-21 2013-05-15 トヨタ自動車株式会社 燃料噴射弁および内燃機関

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2145081A5 (fr) * 1971-07-08 1973-02-16 Peugeot & Renault
US4129256A (en) * 1977-09-12 1978-12-12 General Motors Corporation Electromagnetic unit fuel injector
ES2025054B3 (es) * 1985-12-02 1992-03-16 Marco Alfredo Ganser Aparato para inyeccion de fuel para motores de combustion interna.
CH689282A5 (de) * 1994-03-29 1999-01-29 Christian Dipl-Ing Eth Mathis Einspritzventil fuer eine insbesondere als Dieselmotor vorgesehene Brennkraftmaschine.
US6027037A (en) 1995-12-05 2000-02-22 Denso Corporation Accumulator fuel injection apparatus for internal combustion engine
GB9810208D0 (en) * 1998-05-13 1998-07-08 Lucas Ind Plc Fuel injector
JP3557996B2 (ja) * 1999-06-21 2004-08-25 トヨタ自動車株式会社 燃料噴射装置
DE19936668A1 (de) * 1999-08-04 2001-02-22 Bosch Gmbh Robert Common-Rail-Injektor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102400823A (zh) * 2011-11-09 2012-04-04 王晓燕 一种电控柴油机喷油器
WO2015078629A1 (fr) * 2013-11-28 2015-06-04 Robert Bosch Gmbh Injecteur de carburant
WO2016005180A1 (fr) * 2014-07-08 2016-01-14 Delphi International Operations Luxembourg S.À R.L. Injecteur de carburant pour moteur à combustion interne
US10047709B2 (en) 2014-07-08 2018-08-14 Delphi Technologies Ip Limited Fuel injector for an internal combustion engine
WO2016020469A1 (fr) * 2014-08-08 2016-02-11 Continental Automotive Gmbh Dispositif d'étranglement pour commander une quantité de carburant à alimenter par un injecteur de carburant et système d'injection
CN106662056A (zh) * 2014-08-08 2017-05-10 大陆汽车有限公司 用于控制待供给至燃料喷嘴的燃料的量的节流装置以及喷射装置
US10240566B2 (en) 2014-08-08 2019-03-26 Continental Automotive Gmbh Throttle device for controlling an amount of fuel to be supplied to a fuel injection nozzle, as well as an injection device
CN106662056B (zh) * 2014-08-08 2020-03-27 大陆汽车有限公司 控制待供给至燃料喷嘴的燃料量的节流装置以及喷射装置

Also Published As

Publication number Publication date
US20030052202A1 (en) 2003-03-20
US6698666B2 (en) 2004-03-02
CN1405446A (zh) 2003-03-26
CN1208548C (zh) 2005-06-29
EP1296055A3 (fr) 2004-12-01
EP1296055B1 (fr) 2006-01-11
DE60208615D1 (de) 2006-04-06
DE60208615T2 (de) 2006-09-14

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